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RegularPolygonSource

vtk-examples/Cxx/GeometricObjects/RegularPolygonSource


Description

This example creates a pentagon.

Other languages

See (Python), (Java), (CSharp)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

RegularPolygonSource.cxx

#include <vtkActor.h>
#include <vtkNamedColors.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRegularPolygonSource.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkShrinkPolyData.h>
#include <vtkNew.h>

int main(int , char *[])
{
  vtkNew<vtkNamedColors> colors;

  // Create a pentagon
  vtkNew<vtkRegularPolygonSource> polygonSource;
  polygonSource->SetNumberOfSides(5);
  polygonSource->SetRadius(5);
  polygonSource->SetCenter(0, 0, 0);

  vtkNew<vtkShrinkPolyData> shrink;
  shrink->SetInputConnection(polygonSource->GetOutputPort());
  shrink->SetShrinkFactor(0.9);

  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(shrink->GetOutputPort());

  vtkNew<vtkProperty> back;
  back->SetColor(colors->GetColor3d("Tomato").GetData());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->EdgeVisibilityOn();
  actor->GetProperty()->SetLineWidth(5);
  actor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
  actor->SetBackfaceProperty(back);

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetWindowName("RegularPolygonSource");
  renderWindow->AddRenderer(renderer);
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("Silver").GetData());

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(RegularPolygonSource)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  FiltersGeneral
  FiltersSources
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "RegularPolygonSource: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(RegularPolygonSource MACOSX_BUNDLE RegularPolygonSource.cxx )
  target_link_libraries(RegularPolygonSource PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS RegularPolygonSource
  MODULES ${VTK_LIBRARIES}
)

Download and Build RegularPolygonSource

Click here to download RegularPolygonSource and its CMakeLists.txt file. Once the tarball RegularPolygonSource.tar has been downloaded and extracted,

cd RegularPolygonSource/build

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./RegularPolygonSource

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.